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opr

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OPR

OPR may refer to:

Office of Population Research, the oldest population research center in the United States

Office of Professional Responsibility, part of the United States Department of Justice responsible for investigating attorneys employed therein who have been accused of misconduct or crimes in their professional functions

Office of Public Roads, a predecessor of the United States Federal Highway Administration

Official Pattern Release, used by Trend Micro to refer to the definitions for their antivirus products

Oregon Pacific Railroad (1880–94), in Oregon, United States

Oregon Pacific Railroad (1997), in Oregon, United States

Old Parochial Registers of the Church of Scotland

Operator (disambiguation)

Output Recordings, a British independent record label run by Trevor Jackson, between 1996–2006

Outward Processing Relief, an EU custom duty regulation that provides duty relief on imports of goods from third countries which have been produced from previously exported EU goods.

Overall pressure ratio, the ratio of the stagnation pressure as measured at the front and rear of the compressor of a gas turbine engine